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发明名称
A construction kit for use in teaching mathematics
摘要
申请公布号
GB940065(A)
申请公布日期
1963.10.23
申请号
GB19590037188
申请日期
1959.11.03
申请人
EDMONDUS JOSEPHUS CATHARINA LEPOUDRE
发明人
分类号
G09B23/04
主分类号
G09B23/04
代理机构
代理人
主权项
地址
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